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<h4> ICA </h4>

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<p>The ICA algorithm chosen is an user-specified parameter (See
<a href="icatb_setup_ica.htm">Setup ICA</a>). Depending upon the algorithm chosen, ICA options window pops up 
showing the options available to that algorithm. For explanation of some of the 
algorithms implemented in GIFT and how ICA options effect the ICA process see 
section 3.2 in the <a href="http://icatb.sourceforge.net">manual</a>. </p>

<p>The reduced data-set from the <a href="icatb_data_reduction.htm">data 
reduction step</a> is used and ICA is applied to reveal independent components. 
The components (see Figure 1) represent group components.</p>

<p>Figure 1: ICA applied on reduced data-set of the group</p>
<p class="style1"><img border="0" src="images/icatb_calculate_ica.jpg"></p>
<p> <b>Calculation involved in ICA step:</b></p>
<p>After the ICA algorithm is applied in GIFT, 
weights and activations are stored for future use in
<a href="icatb_back_reconstruct.htm">back reconstruction</a> step. These are stored 
in .mat files with suffix as '_ica'.</p>
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